The paper presents arguments to support the view that the often quoted relation σp = Lim[μKI/(πρ)1/2] as ρ (flaw root radius of curvature) tends to zero, with σp being the peak flaw-tip stress, KI, the effective stress intensity factor, and μ = 2, is strictly valid only for the case of an infinitely deep parabolic flaw. The importance of the parameter μ is highlighted with regards to the problem of fracture initiation at the root of a blunt flaw.

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